5" exhaust
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,353
Likes: 5,946
From: Lake Hartwell, GA
Not sure about the brake system, but unless you are going for 600+ HP then anything over the 4" is not going to do anything for you. The 4" exhaust flows much better than the stock due to the design, but 5" is overkill and is more difficult to install due to limited space where the down pipe is at.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
In the world where the common belief that bigger is better, this another Goldilocks affair. Many who opted for 5" later expressed a desire to back it off to 4". The note from a 5" is not a pleasant one, installation is a real hassle, many feel it looks disproportionate on a pickup, and there are no gains to be had in performance unless you are going to keep the truck on the track.
I don't know how your Pac Brake is built, but my engine braking is before the down pipe. When placed there, pipe sizes of 3 1/2", 4", or 5" make no difference.
I don't know how your Pac Brake is built, but my engine braking is before the down pipe. When placed there, pipe sizes of 3 1/2", 4", or 5" make no difference.
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